CHEMISTRY HIGH SCHOOL

You can measure length with the greatest precision using a tape measure marked in _____.A. meters
B. kilometers
C. millimeters
D. centimeters

Answers

Answer 1
Answer:

Answer:

The answer is C

Explanation:

Precision generally means been accurate (and can be loosely interpreted to mean been exact). Length is averagely measured in meters. However, in order to get the actual length of a substance using a tape, millimeters give the most accurate length (of all the options) as it provides the length to the smallest details (of all the options provided). The illustration below shows the relationship between millimeters and the rest of the options.

while 1 kilometer = 1000 meters

          1 meter = 100 centimeters

          1 centimeter = 10 millimeters

From the relationship above, millimeters is clearly the most precise of all the options provided.
Answer 2
Answer: You can measure length wiht the greatest preciaion using a tape measure marked in milimeters.

Answer: C. milimeters.

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What is the volume of solution needed to make a 0.5M solution, using 250g of NaCl

Calculate the pH of an acetic acid solution, originally 0.25 M, in water. The pKa for acetic acid = 4.76. Use the x-is-small approximation. Enter your answer with two digits after the decimal point.

Answers

Answer:

Initial concentration of acetic acid (CH3COOH_initial): 0.25 M

pKa for acetic acid: 4.76

Assume x is the concentration of H+ ions formed through dissociation.

CH3COOH ⇌ x (due to dissociation)

Apply the x-is-small approximation: We assume x is much smaller than the initial concentration of acetic acid (0.25 M). Therefore, we can neglect x in comparison to 0.25 M.

Calculate pH using the pKa equation:

Rounded to two decimal places, the pH of the acetic acid solution is approximately 2.68.

Explanation:

What would happen to the ratio of copper to iron if you had placed more nails in the beaker ?

Answers

I think the ratio of copper to iron will still be the same even if you add more nails in the beaker. This is because each nail placed is assumed to have the same composition with the other nails and is assumed to be homogeneous.

What is the approximate tilt of the earth?
18°
23°
45°
60°

Answers

The answer is 23.5° but I guess 23° is closest
Not the approximate tilt the exact is 23 1/2  degrees

How many grams of Cl are in 535 g of CaCl2?

Answers

m(Ca Cl_(2))=535 g
m(Cl)=?
The molar mass of CaCl_(2) = 40.08 + 2 * 35.45 = 110.98 
The atomic mass of Cl: 35.45 ( you can see it in the Periodic table) 
110.98 g CaCl_(2)- 35.45 * 2 g Cl
535 g CaCl_(2) - x g Cl
Proportion:
110.98 : 535 = (35,45 * 2) : x
x = 535 * 35.45 * 2 / 110.98 = 37,931.5/110.98 = 341.79 g
Answer: m(Cl)=341.79 g

What is the approximate mass of one mole of oxygen gas (O2)?a. 8 g
b. 16 g
c. 32 g
d. 1.204 × 1024

Answers

The correct answer is B.

1 mol O2  x  15.999 O2/ 1 mol O2 = 15.999 O2

16 O2 when rounded.

How many grams of Ca(OH)2 are needed to produce 600 ml of 1.22 M Ca(OH)2 solution?

Answers

Answer:

54.2 g of Ca(OH)₂

Explanation:

Let's determine the moles of solute, we should need

Molarity . volume (L) = moles

Let's convert 600 mL to L

600 mL/ 1000 = 0.6L

1.22 mol/L . 0.6L = 0.732 moles

Finally we must convert the moles to mass ( moles . molar mass)

0.732 mol . 74.08 g/mol = 54.2 g

Answer: 54.2 g Ca(OH)2

Explanation: Molarity is moles of solute / L solution

First convert mL to L

600 mL x 1L / 1000 mL = 0.6 L

Find moles of Ca(OH)2

n= M x L

= 1.22 M x 0.6 L

= 0.732 moles Ca(OH)2

Convert moles to mass using its molar mass of Ca( OH)2 = 74 g

0.732 moles Ca(OH)2 X 74 g Ca(OH)2 / 1 mole Ca(OH)2

= 54.2 g Ca(OH)2
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